Introduce an abstract cachedItems property on Kit (ConcurrentHashMap<UUID, List<ItemStack>>) to track per-player kit items. Update implementations (BackupKit, GoblinKit, IceMageKit, TemplateKit) to override and initialize cachedItems. GameStateListener now checks dropped items against the selected kit cache and cancels drops (playing a sound) for kit items, and adds handlers to cancel item pickup/despawn outside active game states. Add necessary imports for ItemStack, UUID, ConcurrentHashMap and new event types.
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